And in sub-Saharan Africa, where only four percent of the land is irrigated, buying a small pump can make a big difference.

VOA: standard.2010.08.09

Researchers at Duke University sifted through more than and found an absence of strong evidence that any of these approaches can make a big difference.

VOA: standard.2010.06.17

He says helping just one youth can make a big difference.

VOA: standard.2010.04.29

But those little things make a big difference.

VOA: standard.2010.07.12

This water pump -- called the Super Money Maker -- is designed to make a big difference in the lives of rural Africans.

VOA: standard.2010.08.09